import tensorflow as tf

A = tf.constant([[1,2,3],[4,5,6]])
B = tf.fill([3,4],3)
C = tf.constant([[1,2,3,4],[5,6,7,8]])
with tf.Session() as sess:
    A_value = sess.run(A)
    print('A_value\n',A_value)
    B_value = sess.run(B)
    print('B_value\n', B_value)
    print('C_value\n', sess.run(C))
    matmul = tf.matmul(A,B)
    print('matmul\n',sess.run(matmul))
    add = tf.add(matmul,C)
    print('add\n', sess.run(add))